package com.hmdp.utils;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIdWorker {
    /*
    * 开始时间戳
    * */
    private static final long  BEGIN_TIMESTAMP =1735693200;
    /*
    * 序列号的位数
    * */
    private static final int  COUNT_BITS =32;

    private StringRedisTemplate stringRedisTemplate;

    public RedisIdWorker(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    public Long nextId(String keyPrefix) {
        //1.生成时间蹉
        LocalDateTime now = LocalDateTime.now();
        long  newSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timeStamp = newSecond - BEGIN_TIMESTAMP;

        //2.生成序列号
        //2.1获取当前日期，精准到天
        String data = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        //2.2自增长
        long count = stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + data);
        //3.拼接并返回
        return timeStamp<<COUNT_BITS | count;
    }

}
